Disc records having surface markings

Details Disc records having surface markings Disc records having surface markings

1978-02-17

1981-07-07

Haroian, Harry N.

Dynamic information storage or retrieval

Duplication or copying

264107, 369272, G11B 384

Patent

active

042770718

ABSTRACT:
A record having an information track cut into the surface and a visible pattern formed on surface "lands" bordering the track. The pattern is shallower than the track depth, typically 0.7 micron for a 25 micron sound microgroove record track. A method of providing the marking by applying solvent to a lacquer before cutting a master is described.

REFERENCES:
patent: 1033909 (1912-07-01), Owen
patent: 1477117 (1923-12-01), Gleason
patent: 3247298 (1966-04-01), Utiger
patent: 4066268 (1978-01-01), Borchard et al.
patent: 4144300 (1979-03-01), Breeden

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